Burst Tests of B16.9 Welded Tees

Stonehouse, Mark; Paulin, Tony; Becht, Charles

doi:10.1115/pvp2014-28265

Volume 3: Design and Analysis 2014

DOI: 10.1115/pvp2014-28265

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Burst Tests of B16.9 Welded Tees

Mark Stonehouse

Tony Paulin²,

Charles Becht³

Abstract: This paper presents the results of a small sample of ASME B16.9 welding tee burst tests. The intent of this study was to make a comparison between what is commonly accepted in industry as a B16.9 welding tee to the burst test requirements of B16.9 paragraph 9. The tests conducted show that the current fabrication techniques and some accepted criteria for B16.9 certification can produce thin sections in the tee which do not meet the required burst test pressures. The test descriptions and results… Show more

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Estimation of Maximum Pressure Stress Intensity in a Welding Tee

Blackman¹

2018

Journal of Pressure Vessel Technology

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The required thickness of welding tees is neither specified in ASME (2012, “Factory-Made Wrought Buttwelding Fittings,” American Society of Mechanical Engineers, New York, Standard No. B16.9-2012) nor is a clear calculation method provided in codes such as ASME (2016, “Process Piping,” American Society of Mechanical Engineers, New York, Standard No. B31.3-2016). This can lead to uncertainty regarding the pressure capacity of a tee fitting, particularly one that has suffered from erosion or corrosion. Code methods including area replacement (ASME, 2016, “Process Piping,” American Society of Mechanical Engineers, New York, Standard No. B31.3-2016) or pressure-area (ASME, 2015, “Boiler and Pressure Vessel Code Section VIII Division 2,” American Society of Mechanical Engineers, New York, Standard No. BPVC-VIII-2-2015; BSI, 2014, “Unfired Pressure Vessels Part 3: Design,” BSI, London, UK, Standard No. BS EN 13445-3) do not directly account for the effect which the curvature of the crotch region may have on the stress state in the tee. The approach adopted in this work is to liken the geometry of the tee crotch to the intrados of a torus or pipe bend. The shell theory applicable to the torus is adapted for the tee in order to derive a relationship for circumferential membrane stress. An equivalent tube radius is assigned by determining the local radius of shell curvature in the plane passing through the crotch center of the curvature. The actual stresses in the tee crotch are significantly reduced by the adjoining straight portions. This effect is difficult to quantify theoretically and has thus been investigated by means of finite element analysis (FEA)-based assessments. An empirical relationship was then established providing a conservative correlation between the theoretical stresses and the program calculated local stress intensities.

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Estimation of Maximum Pressure Stress Intensity in a Welding Tee

Blackman¹

2018

Journal of Pressure Vessel Technology

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Burst Tests of B16.9 Welded Tees

Cited by 1 publication

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Estimation of Maximum Pressure Stress Intensity in a Welding Tee

Estimation of Maximum Pressure Stress Intensity in a Welding Tee

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